M ac h i n es



(No Model.) A. H. EMERY.

HOLDER EOE TESTING MACHINES.

Patented Deo. 9

"Unirse Srfrrss liafrenrr @reihe ALBERT IIAMILTONVEMERY, 0F STAh/IFORD, CONNECTICUT, ASSIGNOR TO TIIE EMERY SCALE COMPANY, CF SAME PLACE.

HOLDER FOR TES zflPIElGII-"ICIDIIIUN ferm-ing part of Letters Patent No. 308,957, dated December 9, 1884.

A pplieaion filed February T, ISSl.

To @ZZ whom i may concern:

Be it known that I, ALBERT HAMILTON IEMERY, a citizenV ot' the United States, formerly of New York, new residing at Stamford, in the county of Fairfield and State of Connecticut, haveinvented certain new and useful Improvements in Holders i'or Testing irlachines, of which the following is a specilica tion.

This invention relates to a holder for testing-1nachines constructed with paired wedges sliding within converging seats in a sleeve or casing, so that the strain applied to the specimen will cause the wedges to grip it firmly. The simultaneous and equal movement ot' the wedges longitudinally is compelled by connecting them together without interfering with their radial movement to and from each other. The converging seats ot' the wedges are formed in a bushing screwed within the sleeve or casing of the holder and reversible with the wedges, so that the holder maybe adapted i'or applying strains of either tension or compression and causing the gripping of the specimen by the strain applied thereto.

The above-recited features are also described in another application of mine of even date herewith.

My presentimprovements consist in part in constructing a holder with two or more paired wedges, so as to grip a specimen oi" cylindrical or other shape with a uniform pressure on all sides; also in constructing a reversible converging bushing in two or more parts doweled together; also in the employment of a fixingplate engaging in recesses in the heels olt' the wedges to compel their uniform movement 5 also in the employment of bushings for reducing the aperture of the holder for conforming to the size of the specimen, said bushings having shoulders and dowels engaging in recesses so as to secure them against slipping or movement relatively to the wedges.

In the accompanying drawings, Figure I is a longitudinal section ofthe improved holder adapted to a specimen of cylindrical form. Fig. II is a i'ront view of the same. Fig. III .is an elevation showing three ofthe connected wedges and bushings adapted to grip a square specimen, the fourth wedge being omitted to expose the improved holding-plate which se- (No model.)

cures them against relative longitudinal movenient. Fig. IV is a front or end view of the four wedges and bushings adapted to grip a specimen ci' square section.

The wedges l l may be four, six, or more in number, and are arranged in pairs so as to grip a specimen at opposite poi nts. They slide longitudinally in converging seats, and within a bushing, 5, secured within the sleeve or easing of the holder, and reversible to iit thewedgcs, so as to adapt them to operate in applying strains of either tension 0r compressien, and to tightly grip the specimen by the force of the strain applied. A ring or annular plate, (i, is inserted in the annular recess between the screw-thread and the face of the holder in order to adapt the sleeve to provide a solid bearing and support t0 sustain vthe radial pressure of the wedges under strain.

To compel the uniform and simultaneous movement of the wedges without interfering with their radial motion to and from each other, I employ a plate, i, Figs. III and IV, occupying recesses 3 inthe faces of the wedges near their heels and secured to one of the wedges by a screw, elf". In my present inven tion this plate, which is removable with the combined set ot' wedges and is independent of the stem or shank 7 of the holder, takes the place oi" the plate or head Tguided byastem, 9, as shown in Fig. I, and described and claimed in another application ot' mine of even date herewith. One or more springs, 8, bearing through a plunger, 9, against the heels of the wedges press them forward so as to apply initial pressure to the specimen.

To adapt the holder to the size ol the speci nien to be tested, I employ bushings I0 of suitable shape and thickness, having shoulders 11 and dowels l2 iitting in corresponding recesses in the faces oil the wedges, so as to secure the bushings against longitudinal or lateral movement relatively to the wedges. In Figs. I and Il two pair of wedges are shown with bushings l0 adapted to a specimen, 13, of cylindrical i'orm.

In Figs. III and lV bushings l0 are shown adapted for operating on a square bar.

li represents an ejeeting-spring within the stem ofthe holder operating on a plunger, 15, so as to throw the specimen ont when it is re leased by the forcing back of the Wedges, Which is effected by any suitable device. The Wedges are, furthermore, formed with splines ,167 occupying corresponding grooves in the 5 bushing 5, so as to Withdraw them by an outward radial movement from the specimen when they are forced back longitudinally.

Having thus described my invention, the

following is what I claim as new therein and 1o desire to secure by Letters Patent:

l. A holder for testing-machines constructed with two or more pairs of Wedges having cyf1 lindrieal backs to permit them to rock on their axes and to slide longitudinally7 and I5 adapted for gripping specimens of square, round, or other section on opposite sides.

2. The combination of gripping-Wedges, a sleeve or case in which they slide, and a screwbushing made in, two or more parts doweled 2o together and forming seats for the gripping- Wedges, substantially as set forth.

3. The combination, with the sleeve or case and gripping-wedges, of a fixing-plate disconnected from the stem or plunger and fitting in recesses in the several Wedges to compel 25 them to slide in unison, as set forth.

4. In combination with two or more sliding Wedges, the shouldered inner bushings, fitting corresponding seats in the Wedges, and serving to reduce the size of the opening.

5. In a holder for testing-machines, the combination, with the gripping-Wedges and bushings, of dowel pins for retaining the said bushings against movement relatively to the Wedges, as explained. Y 35 6. In combination with the sleeve or case and gripping-wedges, the ejecting plunger and spring, substantially as and for the purpose set forth.

ALBERT H EMERY.

lVitnesses:

Ooriivius KNIGHT, HARRY E. KNIGHT. 

